{"id":1019,"date":"2025-12-23T09:01:15","date_gmt":"2025-12-23T01:01:15","guid":{"rendered":"https:\/\/www.guanhaobo.cn\/?p=1019"},"modified":"2025-12-23T09:01:15","modified_gmt":"2025-12-23T01:01:15","slug":"leetcode-347-%e5%89%8d-k-%e4%b8%aa%e9%ab%98%e9%a2%91%e5%85%83%e7%b4%a0","status":"publish","type":"post","link":"https:\/\/www.guanhaobo.cn\/?p=1019","title":{"rendered":"LeetCode 347 \u2013 \u524d K \u4e2a\u9ad8\u9891\u5143\u7d20"},"content":{"rendered":"<h1>\u9898\u76ee\u63cf\u8ff0<\/h1>\n<p>\u7ed9\u4f60\u4e00\u4e2a\u6574\u6570\u6570\u7ec4 nums \u548c\u4e00\u4e2a\u6574\u6570 k \uff0c\u8bf7\u4f60\u8fd4\u56de\u5176\u4e2d\u51fa\u73b0\u9891\u7387\u524d k \u9ad8\u7684\u5143\u7d20\u3002\u4f60\u53ef\u4ee5\u6309 \u4efb\u610f\u987a\u5e8f \u8fd4\u56de\u7b54\u6848\u3002<\/p>\n<p>\u793a\u4f8b\uff1a<br \/>\n\u8f93\u5165\uff1anums = [1,1,1,2,2,3], k = 2<br \/>\n\u8f93\u51fa\uff1a[1,2]<\/p>\n<h1>\u9898\u76ee\u5206\u6790<\/h1>\n<p>\u5148\u7edf\u8ba1\u51fa\u6bcf\u4e2a\u5143\u7d20\u51fa\u73b0\u7684\u6b21\u6570\uff0c\u518d\u4f7f\u7528\u4f18\u5148\u961f\u5217\u7ef4\u62a4 k \u4e2a\u6700\u5927\u6b21\u6570\u7684\u5143\u7d20\u3002<br \/>\n\u65f6\u95f4\u590d\u6742\u5ea6 O(n * log k)<\/p>\n<h1>Java<\/h1>\n<pre><code class=\"language-java line-numbers\">public int[] topKFrequent(int[] nums, int k) {\n    Map&lt;Integer, Integer&gt; map = new HashMap&lt;&gt;();\n    Queue&lt;Integer&gt; queue = new PriorityQueue&lt;&gt;((o1, o2) -&gt; Integer.compare(map.getOrDefault(o1, 0), map.getOrDefault(o2, 0)));\n    for (int n : nums) {\n        map.put(n, map.getOrDefault(n, 0) + 1);\n    }\n    for (int n : map.keySet()) {\n        queue.offer(n);\n        if (queue.size() &gt; k) {\n            queue.poll();\n        }\n    }\n    int size = queue.size();\n    int[] ans = new int[size];\n    for (int i = 0; i &lt; size; i++) {\n        ans[i] = queue.poll();\n    }\n    return ans;\n}\n<\/code><\/pre>\n<h1>Kotlin<\/h1>\n<pre><code class=\"language-kotlin line-numbers\">fun topKFrequent(nums: IntArray, k: Int): IntArray {\n    val map = HashMap&lt;Int, Int&gt;()\n    val queue = PriorityQueue&lt;Int&gt; { o1, o2 -&gt; Integer.compare(map.getOrDefault(o1, 0), map.getOrDefault(o2, 0)) }\n    for (n in nums) {\n        map[n] = (map[n] ?: 0) + 1\n    }\n    for (n in map.keys) {\n        queue.offer(n)\n        if (queue.size &gt; k) {\n            queue.poll()\n        }\n    }\n\n    return queue.toIntArray()\n}\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u9898\u76ee\u63cf\u8ff0 \u7ed9\u4f60\u4e00\u4e2a\u6574\u6570\u6570\u7ec4 nums \u548c\u4e00\u4e2a\u6574\u6570 k \uff0c\u8bf7\u4f60\u8fd4\u56de\u5176\u4e2d\u51fa\u73b0\u9891\u7387\u524d k \u9ad8\u7684\u5143\u7d20\u3002\u4f60\u53ef\u4ee5\u6309 \u4efb\u610f\u987a [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[20,79,74],"class_list":["post-1019","post","type-post","status-publish","format-standard","hentry","category-algo","tag-leetcode","tag-79","tag-74"],"_links":{"self":[{"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/posts\/1019","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1019"}],"version-history":[{"count":1,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/posts\/1019\/revisions"}],"predecessor-version":[{"id":1020,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/posts\/1019\/revisions\/1020"}],"wp:attachment":[{"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1019"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1019"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1019"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}